A sensorless control method for PMSM based on ESMO and SPLL

Abstract

The application is suitable for the technical field of motor control, and provides a PMSM sensorless control method based on ESMO and SPLL, comprising: establishing a foc vector control mathematical model of a permanent magnet synchronous motor; designing an extended sliding mode observer by regarding back electromotive force as a state variable, adopting a double power sliding mode surface and a high-order sliding mode control law with an adaptive variable speed approaching term to complete back electromotive force observation; connecting an improved SOGI module with a compensation link to filter and process the observation signal and cross-compensate two-phase back electromotive force errors, optimizing a phase discriminator and a loop filter of a phase-locked loop, and extracting rotor position and speed; connecting the outputs of the observer and the phase-locked loop to a FOC vector control system to complete sensorless control closed loop building. The application effectively suppresses the chattering problem of the traditional sliding mode observer, improves the phase discrimination accuracy and dynamic response speed under low-speed working conditions, and enhances the anti-interference ability under load mutation.

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